Optimize thread safe code and replace the synchronized class "StringBuffer" by an unsynchronized one "StringBuilder". (#2704)

fix issue with assertion in HystrixStreamTests, polish diamond operator and follow class field naming convention (#2703)

* fix assertion check

* polish: replace the type specification in this constructor call with the diamond operator ("<>"),
make EUREKA_PACKAGES final to avoid issue "static non-final field names should comply with a naming convention"

See https://github.com/spring-cloud/spring-cloud-commons/issues/310

Prevent RibbonRoutingFilter throws exceptions when Http status codes are non-standard(Against the 1.4.x branches) (#2671)

* This PR fixes #2639 and against the 1.4 branches

Hopefully spring boot logging provides enough of the API for
Archaius to work (I think that's the only reason it was there).
Causes issues with logging switching to JUL at odd times (like
on context closed events).

Remove deprecated ZuulFallbackProvider in favor of FallbackProvider.  Add route parameter to fallbackResponse.  Fixes #2655 (#2664)

Fixes #2625

fixes gh-2629